package com.atguigu.override;

public class Base {//父类，又称为基类
    public void m1(){
        //....不关心方法体
    }
    public double m2(){
        return 0.0;
    }

    public Object m3(){
        return null;
    }

    protected void m4(){

    }

    public void print1n(){

    }
}
